iOS Microsoft Excel File Corrupted
I am having problems opening files on my ipad pro using the Excel program for ios. I can work on a file (located in Dropbox) several times and then for no reason that I can determine, I can no longer open the file...getting the message 'cannot open file, file corrupted'. I can still open the file on any of my other computers, but the only way to get it to open again on the iPad is to do a 'save as' command and rename it on the computer. This is a huge issue as I have converted to traveling with my iPad pro instead of my laptop, so when on the road for business, I am stuck with files that cannot be opened. Does anybody have any knowledge of this problem that can shed some light on a fix? Otherwise the iPad Pro is going to become a home decoration and I'll go back to the laptop and an external wifi device...
iPad Pro Wi-Fi, Cellular, iOS 9.2.1